How to create an empty dataframe from a vector of row names and column names

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It not quite clear to me how a DataFrame containing many columns where the first column column contains many row names can be describe as “empty”.

Do you want this?

julia> df = DataFrame()
0×0 DataFrame

julia> df[:rowname] = rn
3-element Array{String,1}:
 "row1"
 "row2"
 "row3"
julia> for c in cn
          df[Symbol(c)] = 0.0
          end

julia> df
3×4 DataFrame
│ Row │ rowname │ col1    │ col2    │ col3    │
│     │ String  │ Float64 │ Float64 │ Float64 │
├─────┼─────────┼─────────┼─────────┼─────────┤
│ 1   │ row1    │ 0.0     │ 0.0     │ 0.0     │
│ 2   │ row2    │ 0.0     │ 0.0     │ 0.0     │
│ 3   │ row3    │ 0.0     │ 0.0     │ 0.0     │
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